Nanocomposites and nanomaterials

Calculation of optical properties of coated nanoparticles on the surface.
Galyna Strilchuk1
1 Institute of High Technologies, Taras Shevchenko National University of Kyiv. 64 Volodymyrska str, Kyiv, 01601, Ukraine. 
E-mail: gstrilchuk@gmail.com

The work is devoted to the modeling of particles in the shell, which was placed on dielectric or metallic substrates. The basis of the simulation is the theory of the near field and the calculation of the effective susceptibility of the particle [1]. Therefore, the dissipative function of the system and the absorption dependence on the light frequency was calculated. Such optical methods for nanoparticles investigating can be applied to bioparticles [2].
The calculation was made for spherical viruses, optical properties of viral core and shell was taken from literature. Since bioparticles, such as viruses, are usually complex objects that consist of a variety of components, the task has been expanded. The paper proposes a calculation for particles with one, two or more shells with different optical properties. The interaction of the particle and the surface was demonstrated on the absorption spectra.
In this work, a viral particle with two shells (capsids) has been simulated, and the thickness of the particle's shell has been calculated with comparison to experiment with the data taken in the literature [3]. 

1.	Lozovski V. Susceptibilities of nano-particles at the surface of a solid // Physica E —2001. —V.9. —P.642—651.
2.	Manchester M., N.F. Steinmetz. Viruses and nanotechnology.  // Berlin: Springer —2009. — P.144.
3.	Anže Lošdorfer Božič, Antonio Šiber, Rudolf Podgornik, Statistical analysis of sizes and shapes of virus capsids and their resulting elastic properties// J Biol Phys. —2013 —39(2) —215–228.